linux-kernel - [PATCH 04/11] riscv: mm: Deduplicate _PAGE_CHG

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Message-ID: <20241102000843.1301099-5-samuel.holland@sifive.com>
Date: Fri,  1 Nov 2024 17:07:58 -0700
From: Samuel Holland <samuel.holland@...ive.com>
To: Palmer Dabbelt <palmer@...belt.com>,
	linux-riscv@...ts.infradead.org,
	Conor Dooley <conor@...nel.org>
Cc: devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Alexandre Ghiti <alexghiti@...osinc.com>,
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
	Emil Renner Berthing <kernel@...il.dk>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Samuel Holland <samuel.holland@...ive.com>
Subject: [PATCH 04/11] riscv: mm: Deduplicate _PAGE_CHG_MASK definition

The two existing definitions are equivalent because _PAGE_MTMASK is
defined as 0 on riscv32.

Signed-off-by: Samuel Holland <samuel.holland@...ive.com>
---

 arch/riscv/include/asm/pgtable-32.h | 5 -----
 arch/riscv/include/asm/pgtable-64.h | 7 -------
 arch/riscv/include/asm/pgtable.h    | 6 ++++++
 3 files changed, 6 insertions(+), 12 deletions(-)

diff --git a/arch/riscv/include/asm/pgtable-32.h b/arch/riscv/include/asm/pgtable-32.h
index 23137347dc15..7dc0751d67dc 100644
--- a/arch/riscv/include/asm/pgtable-32.h
+++ b/arch/riscv/include/asm/pgtable-32.h
@@ -28,11 +28,6 @@
 #define _PAGE_IO		0
 #define _PAGE_MTMASK		0
 
-/* Set of bits to preserve across pte_modify() */
-#define _PAGE_CHG_MASK  (~(unsigned long)(_PAGE_PRESENT | _PAGE_READ |	\
-					  _PAGE_WRITE | _PAGE_EXEC |	\
-					  _PAGE_USER | _PAGE_GLOBAL))
-
 #define pud_pfn(pud)				(pmd_pfn((pmd_t){ pud }))
 #define p4d_pfn(p4d)				(pud_pfn((pud_t){ p4d }))
 #define pgd_pfn(pgd)				(p4d_pfn((p4d_t){ pgd }))
diff --git a/arch/riscv/include/asm/pgtable-64.h b/arch/riscv/include/asm/pgtable-64.h
index 33e7ff049c4a..4ba88592b8d1 100644
--- a/arch/riscv/include/asm/pgtable-64.h
+++ b/arch/riscv/include/asm/pgtable-64.h
@@ -66,7 +66,6 @@ typedef struct {
 
 #define pmd_val(x)      ((x).pmd)
 #define __pmd(x)        ((pmd_t) { (x) })
-
 #define PTRS_PER_PMD    (PAGE_SIZE / sizeof(pmd_t))
 
 /*
@@ -166,12 +165,6 @@ static inline u64 riscv_page_io(void)
 #define _PAGE_IO		riscv_page_io()
 #define _PAGE_MTMASK		riscv_page_mtmask()
 
-/* Set of bits to preserve across pte_modify() */
-#define _PAGE_CHG_MASK  (~(unsigned long)(_PAGE_PRESENT | _PAGE_READ |	\
-					  _PAGE_WRITE | _PAGE_EXEC |	\
-					  _PAGE_USER | _PAGE_GLOBAL |	\
-					  _PAGE_MTMASK))
-
 static inline int pud_present(pud_t pud)
 {
 	return (pud_val(pud) & _PAGE_PRESENT);
diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
index 3e0e1177107d..afa0b455eaa4 100644
--- a/arch/riscv/include/asm/pgtable.h
+++ b/arch/riscv/include/asm/pgtable.h
@@ -201,6 +201,12 @@ extern struct pt_alloc_ops pt_ops __meminitdata;
 #define _PAGE_IOREMAP	((_PAGE_KERNEL & ~_PAGE_MTMASK) | _PAGE_IO)
 #define PAGE_KERNEL_IO		__pgprot(_PAGE_IOREMAP)
 
+/* Set of bits to preserve across pte_modify() */
+#define _PAGE_CHG_MASK  (~(unsigned long)(_PAGE_PRESENT | _PAGE_READ |	\
+					  _PAGE_WRITE | _PAGE_EXEC |	\
+					  _PAGE_USER | _PAGE_GLOBAL |	\
+					  _PAGE_MTMASK))
+
 extern pgd_t swapper_pg_dir[];
 extern pgd_t trampoline_pg_dir[];
 extern pgd_t early_pg_dir[];
-- 
2.45.1